{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "These neurotoxins display different biochemical activities , but similarly alter the presynaptic membrane permeability causing Ca ( 2 + ) overload within the nerve terminals , which in turn induces nerve degeneration ."}
{"Chemical": ["Ca ( 2 + )"]}